First Symantec is crap. I say this because of experience with it in my data center and client data centers.
It locked up all my servers which was tracked down because the program causes a memory leak and eventually locks the machine.
I would suggest trying to stop all services related to Symantec and test to see if reboots still occur.

Ryansoto - that isnt really a constructive comment. Symantec works for the most part without issue. The problems are, i believe, based around the permissions and linking into different aspects of the drivers.

so...you dont know if symantec is the problem or not?
My advice is to force the removal of symatec. assuming this is a client and not the symantec server.
This should speed up your troubleshooting time by narrowing down if sav is causing the issue.
download cleanwipe from the following location.http://www.experts-exchange.com/Software/Internet_Email/Anti-Virus/Symantec/Q_23798519.html
follow the steps to raname the file from .txt to .exe
test and post back

Servers had been behaving pretty well recently (maybe we just werent copying much around or had got used to how to move data without tempting fate) until another engineer came in and unknowingly deleted a profile caused one of the dfs servers to reboot.

Unfortunately as most of the servers are the only server on each site they are also running Symantec Server for that site so removal of the whole server isnt top of my todo list at the moment.

I do have one server (the hub for all DFS traffic) that I am going to look at removing SAV off at some point.

I am also toying with the process of upgrading from SAV10.2 to SEP 11 and see if that fixes my issues just need to plan this for 7 sites

That's a good thought to patch the servers - the big issue i have is scheduling the relevant downtime on the network. its very much a "fix the problem but you cant do it out of hours because we cant organise paying you in time and we cant do it in hours because people need to work on the systems"

I also think it will turn out to be Symantec related, not to bash any product or vendors, but I actively encourage my clients to avoid Symantec products if possible, especially with complex setups & critical servers.
also not to be mentioning the obvious, DFS best practices